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-rw-r--r--kernel/async.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/kernel/async.c b/kernel/async.c
index 97f224a525..4c3e6a4459 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -64,6 +64,7 @@ static async_cookie_t next_cookie = 1;
static LIST_HEAD(async_global_pending); /* pending from all registered doms */
static ASYNC_DOMAIN(async_dfl_domain);
static DEFINE_SPINLOCK(async_lock);
+static struct workqueue_struct *async_wq;
struct async_entry {
struct list_head domain_list;
@@ -174,7 +175,7 @@ static async_cookie_t __async_schedule_node_domain(async_func_t func,
spin_unlock_irqrestore(&async_lock, flags);
/* schedule for execution */
- queue_work_node(node, system_unbound_wq, &entry->work);
+ queue_work_node(node, async_wq, &entry->work);
return newcookie;
}
@@ -345,3 +346,17 @@ bool current_is_async(void)
return worker && worker->current_func == async_run_entry_fn;
}
EXPORT_SYMBOL_GPL(current_is_async);
+
+void __init async_init(void)
+{
+ /*
+ * Async can schedule a number of interdependent work items. However,
+ * unbound workqueues can handle only upto min_active interdependent
+ * work items. The default min_active of 8 isn't sufficient for async
+ * and can lead to stalls. Let's use a dedicated workqueue with raised
+ * min_active.
+ */
+ async_wq = alloc_workqueue("async", WQ_UNBOUND, 0);
+ BUG_ON(!async_wq);
+ workqueue_set_min_active(async_wq, WQ_DFL_ACTIVE);
+}